Capiel, Modesto, and Aurelio Sierra Bracero. “Yield and Quality of Irrigated Tobacco Under Subhumid Conditions”. The Journal of Agriculture of the University of Puerto Rico 52, no. 4 (October 1, 1968): 281–294. Accessed November 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/11487.